74ACQ646SC Fairchild Semiconductor, 74ACQ646SC Datasheet - Page 2

• Manufacturer Part Number: 74ACQ646SC
• Description: IC TXRX/REGISTER 3ST 8BIT 24SOIC
• Manufacturer: Fairchild Semiconductor
• Series: 74ACQr

Specifications of 74ACQ646SC

• Logic Type: Registered Transceiver, Non-Inverting
• Number Of Elements: 1
• Number Of Bits Per Element: 8
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 2 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Logic Symbols
Function Table
H
L

X
Note 1: The data output functions may be enabled or disabled by various signals at the G and DIR inputs. Data input functions are always enabled; i.e., data
at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs.
LOW Voltage Level
HIGH Voltage Level
Immaterial
LOW-to-HIGH Transition
G
H
H
H
L
L
L
L
L
L
L
L
DIR
H
H
H
H
X
X
X
L
L
L
L
CPAB CPBA
H or L H or L
H or L



X
X
X
X
X
X
Inputs
H or L



X
X
X
X
X
X
SAB
X
X
X
H
H
X
X
X
L
L
X
SBA
H
H
X
X
X
X
X
X
X
L
L
Data I/O (Note 1)
Output
A
Input
Input
0
–A
7
2
Output Clock A
B
Input
Input
0
–B
7
Isolation
Clock A
Clock B
A
A Register to B
Clock A
B
Clock B
B Register to A
Clock B
n
n
to B
to A
n
n
n
n
n
n
n
n
—Real Time (Transparent Mode)
—Real Time (Transparent Mode)
Data into A Register
Data into B Register
Data into A Register
Data into A Register and Output to B
Data into B Register
Data into B Register and Output to A
n
n
IEEE/IEC
(Stored Mode)
(Stored Mode)
Function
n
n